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Minutes interim-2018-lpwan-06: Wed 17:00
minutes-interim-2018-lpwan-06-201806131700-00

Meeting Minutes IPv6 over Low Power Wide-Area Networks (lpwan) WG
Date and time 2018-06-13 15:00
Title Minutes interim-2018-lpwan-06: Wed 17:00
State Active
Other versions plain text
Last updated 2018-06-13

minutes-interim-2018-lpwan-06-201806131700-00
Connection details
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*    Date: June 13, 2018
*    Time: 8-9AM DST, 17:00 CEST:
https://www.worldtimebuddy.com/?qm=1&lid=2988507,1816670,5391959,5128581&h=2988507&date=2018-06-13&sln=17-18
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Minute takers
-------------

*    Ana Minaburo
*    Pascal Thubert
*    Dominique Barthel
*    Carles Gomez
*    Alexander Pelov

Attendees
---------
Ana Minaburo
Laurent Toutain
Pascal Thubert
Alexander Pelov
Carles Gomez
Dominique Barthel
Juan Carlos Zuniga
Julien Catalano
Ricardo Andreasen

Past Attendees
---------

*    Alex Pelov
*    Flavien Moullec
*    Felipe Díaz-Sánchez
*    Ana minaburo
*    Dominique Barthel
*    Laurent Toutain
*    Carles Gomez
*    Ivaylo Petrov
*    Juan-Carlos Zuniga
*    Julien Catalano
*    Orne Brocaar
*    Pascal Thubert
*    Vijay Gharge
*    Orne Brocaar
*    Paventhan Arumugam
*    Paul Duffy
*   Diego Dujovne
*    Pascal Thubert
*    Alex Pelov
*    Laurent Toutain
*    Ana Minaburo
*    Vanessa Valderrama
*    Dominique Barthel
*    Julien Catalano
*    Edgar Ramos
*    Carles Gomez
*    J Sanchez
*    Ramon Sanchez
*    Juan-Carlos Zuniga
*    Felipe Díaz-Sánchez

Action Items from last time
----------------------------
Chairs: find reviewers for drafts

Agenda
------

*    [17:05] Administrivia                                           [ 5min]
    o    Note-Well, Scribes, Agenda Bashing
    o    Status of drafts

*    [17:10] SCHC padding - Dominique                                [10min]
*    [17:20] SCHC Tickets and Discussed options - Ana                [30min]
*    [17:50] SCHC CoAP - Laurent                                     [10min]
*    [18:00] AOB                                                     [ 0min]

Minutes
-------

*    [17:05] Administrivia                                           [ 5min]
    o    Note-Well, Scribes, Agenda Bashing
    o    Status of drafts
Pascal: Makes the note well
Pascal: main goal is to finish SCHC
Alex: validate last meeting minutes
Two reviewers: Sothy, Juan Carlos, Charles Perkins

*    [17:10] UDP checksum elision in SCHC - Pascal
Pascal: presents the text for the MIC, take care of the differences between the
RFC 6282 case and SCHC Pascal: The text asks for special care since if data are
corrupted between compression and fragmentation, there will be no way to detect
it Ana: new section for this in the SCHC draft? Pascal: yes.

*    [17:10] SCHC padding - Dominique                                [10min]
Dominique: converging in this single padding proposal, gives a brief

Dominique explains the status of the proposal. Two wakeup calls in the last two
weeks. 6 positive responses, no negative response from the list. Time to make a
decision? Could publish new version by end of week. Alex: I suggest you go
ahead, merge it with the main branch

*    [17:20] SCHC Tickets and Discussed options - Ana                [30min]

Ana:7 open tickets (3 green discussion we had during past meeting)
Ana: ticket not discussed before:
    - use of fragmentation. With the new session explaining the layer in SCHC,
    the ticket is almost done. The technology specific document will have to
    discribe if fragmentation has to be used.
Dominique: I exchanged emails with Edgar. His understanding of NB-IoT
capabilities is being refined, padding and frag are investigated. I would
recommend to stay abstract and generic in the SCHC draft. Edgar expressed
support of the new padding proposal. Ana: multi-rat is out of the scope, the
change of channel characterisitic is not solved. More discussion to see if the
group has to go further. PAscal: we always had the question of changing SF
during fragmentation for LoRa, SF change it is not supported. Add some text
saying that the document is not targeting on it, but can be added to a TSD Ana:
on DTag. Only 1 SCHC packet at a given time. Discussed at technical meeting,
and decided to close the ticket. Any issues? [None] Pascal: we need to request
for publication this document (SCHC) before rechartering

Ana: write that the ruleId for Ack is the same as the fragment packet.

Ana: New ticket Ack always baseline description, a sentence has been removed by
mistake. Will be do after jthe join of branches in github

Ana: ticket #29: to be clearer when explaining the bitmap encoding.
Ana: will check after merging the two branches

Ana: can we close ticket #12? [replies from folks: Yes]
Ana: on ticket #20.
Laurent: I think Option 2 is good. "L2 Word" adds an initial difficulty because
it introduces an abstraction, but at the end makes the description much
simpler. Alex (chair-hat off): I also think adding the "L2 word" term is an
improvement Dominique: #20 was really about the graphical representation of the
drawing. An arrow on both sides of "byte boundary" conveyed the idea that there
was one and only one byte between the arrows. A single arrow pointing right is
intended to convey the meaning that this boundary can encompass one or more
bytes from the beginning of the field. This is not about Byte vs L2 Word.
Dominique: I think nobody disagreed with the single, right-pointing arrow, no
need to discuss it further

Ana: last ticket is C bit in ACK. Consensus is draw the attention that the last
ACK is one bit bigger Ana: next steps: apply the changes and publish!

Alex: was this all tickets?
Ana: yes!

Alex: when could we have the new draft version?
Ana: we need to make the changes with Dominique, we need to schedule one day
for that Alex: the sooner we get the reviews, the better. Pascal: shoot for
last Wednesday of this month? Ana, others: yes Target (cut-off) date not to be
missed July 2nd.

Pascal: tomorrow the IETF agenda will be published. If the scheduled day for
the LPWAN session is an issue, please let us know ASAP

*    [17:50] SCHC CoAP - Laurent                                     [10min]
Laurent: Changes in the new version
* Publish a new version if we agree today
* New section where we can do SCHC Compression for CoAP: One global and the
other one when security is there and you need to do it end to end * Delete
rules that are already done in the SCHC draft * Section to describe the
differences between CoAP and UDP/IPv6 compression * Difference between SCHC for
CoAP and IP/UDP * Each CoAP field is explained and presented how SCHC works on
it * Type of compression that you can use for the different fields (e.g. Type
can use up- and down- ...) * Code has almost the same behavior, we can use
matchmapping and specific rules to do that * Message ID need discussion not all
the details has been introduced * Dev is a client What is the size we can send
in the link * Dev is server we need to use a proxy and security issues, need
more disucssion in this behavior * Exchange life time value is very important
in LPWAN * During this period the same value cannot be used (introduce in the
time scale draft sent to Core WG) * Retransmission can happen at any time * The
exchange time depends on the DWL and ACK will be send in this anticipation
window Alex: Does it requires in the timesclae draft of Corre WG? Laurent: Yes,
this exchange lifetime will be send in the Time scale option Alex: can we do it
without Timescale option? Laurent: No,

Discussion needed:
    * Block: is it compatible with LPWAN?
     Alex: they are complimentary
    * Observe
    * No Response
    * Time Scale: Needs more discussion with Core WG
    * OSCORE is already done, may be presented next interim meeting

 Pascal: can we request publication for this at the same time as SCHC (IP/UDP)?
 Laurent: We need a CoAP expert to review and Sheperd this document
 Pascal: We can do last call and see with Core. WGLC will force people to
 review the document. Laurent: many things are open to discussion (different
 options for doing things, etc)

Alex: ask if we can split in two documents: SCHC COAP based and one SCHC COAP
extended for advanced stuffs to have more time for discussion Laurent: 2 bit
for your MID Alex: a last call will make people react Alex: let's see if it is
possible to do the split, otherwise we may need a new target date for the CoAP
work Laurent: look at the text on GitHub, this is what we want to discuss.
ToDO: Publish a new version

*    [18:00] AOB                                                     [ 0min]